CMT2210LW データシートの表示（PDF） - Unspecified

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CMT2210LW

Low-Cost 315/433.92 MHz OOK Stand-Alone Receiver

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5. Functional Descriptions

CMT2210LW

RFIN

VDD

GND

I-MXR

LNA

Q-MXR

LO GEN

LDOs

Bandgap

POR

Image

Rejection

Band-pass

Filter

I-LMT

RSSI

SAR

AGC

OOK

DEMOD

AFC & AGC

VCO

Q-LMT

Loop

Filter

PFD/CP

FXTAL

DIVIDER

AFC & Σ-Δ Modulator

VCON VCOP

Figure 10. Functional Block Diagram

Radio

Controller

DOUT

XOSC

XIN XOUT

5.1 Overview

The CMT2210LW is ultra low power, high performance, low-cost OOK stand-alone RF receiver for various 315/433.92 MHz

wireless applications. It is part of the CMOSTEK NextGenRFTM family, which includes a complete line of transmitters, receivers

and transceivers. The chip is based on a fully integrated, low-IF receiver architecture. The low-IF architecture facilitates a very

low external component count and does not suffer from powerline - induced interference problems. The synthesizer contains a

VCO and a low noise fractional-N PLL with an output frequency resolution of 24.8 Hz. The VCO operates at 2x the Local

Oscillator (LO) frequency to reduce spurious emissions. Every analog block is calibrated on each Power-on Reset (POR) to the

internal reference voltage. The calibration helps the device to finely work under different temperatures and supply voltages. The

baseband filtering and demodulation is done by the digital demodulator. The demodulated signal is output to the external MCU

via the DOUT pin.

The CMT2210LW is a true plug-and-run device, no register control or manufacturing programming is needed. This simplifies the

development and manufacturing effort significantly. The operation frequency can be changed between 315 and 433.92 MHz by

selecting proper value of crystal, and it can work with most low end transmitters with its good adaptability. The CMT2210LW

operates from 1.8 to 3.6 V so that it can finely work with most batteries to their useful power limits. The receive current is only 3.3

mA at 315 MHz and 3.8 mA at 433.92 MHz. The CMT2210LW receiver together with the CMT211x transmitter enables an ultra

low cost RF link.

5.2 Modulation, Frequency and Symbol Rate

The CMT2210LW supports OOK demodulation with the symbol rate from 0.1 to 3.4 ksps. It supports the license free ISM

frequencies around 315 MHz and 433.92 MHz. The internal frequency synthesizer contains a high-purity VCO and a low noise

fractional-N PLL with an output frequency resolution of 24.8 Hz. See the table below for the demodulation, frequency and symbol

rate information.

Rev 0.8 | Page 10/20

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